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Up to now, our society ________ with limited living space and a shortage of natural resources.

A．has been challenged	B．is being challenged
C．is challenging	D．has challenged

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We’ll not attend the meeting _____ we are invited.

A．if

B．and

C．unless

D．once

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This is the second time that he ____________ China.

A．will visit

B．visits

C．is to visit

D．has visited

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I offered my ____________John ______ winning the sports.

A．congratulation to; on	B．congratulations to; on
C．congratulations; on	D．congratulations on; for

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-- A good book is a good friend. You can get the help you need from it.
----- You said it. ___________.

A．I agree	B．All right
C．I disagree	D．That’s a good idea

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_____ of the students who took part in the military training is 450.

A．A number

B．A lot

C．Lots

D．The number

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